package org.madao.gulimall.product.web;

import org.madao.gulimall.product.entity.CategoryEntity;
import org.madao.gulimall.product.service.CategoryService;
import org.madao.gulimall.product.vo.Catelog2Vo;
import org.redisson.api.RLock;
import org.redisson.api.RReadWriteLock;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

@Controller
public class IndexController {

    @Autowired
    CategoryService categoryService;

    @Autowired
    RedissonClient redisson;

    @Autowired
    StringRedisTemplate redisTemplate;

    @GetMapping({"/","/index"})
    public String indexPage(Model model){

        //TODO 1.查出所有的1级分类
        List<CategoryEntity> categoryEntityList = categoryService.getLevel1Categorys();

        model.addAttribute("categorys",categoryEntityList);

        return "index";
    }

    @ResponseBody
    @GetMapping("/index/catalog.json")
    public Map<String, List<Catelog2Vo>> getCatalogJson(){

        Map<String, List<Catelog2Vo>> catalogJson = categoryService.getCatalogJson();
        return catalogJson;
    }


    @ResponseBody
    @GetMapping("/write")
    public String writeValue(){
        RReadWriteLock lock = redisson.getReadWriteLock("rw-lock");
        String s="";
        RLock rLock = lock.writeLock();

        try {
            //1.改数据加写锁，读数据加读锁
            rLock.lock();
            s= UUID.randomUUID().toString();
            Thread.sleep(30000);
            redisTemplate.opsForValue().set("writeValue",s);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            rLock.unlock();
        }

        return s;
    }

    //保证一定能督导最新数据，修改期间，写锁是一个排它锁，（互斥锁，独享锁），读锁是一个共享锁
    //写锁没释放就必须等待
    //读+读：相当于无锁，并发读，只会在redis中记录号，所有当前的读锁，他们都会级
    //写+读：等待写锁释放
    //写+写：阻塞方式
    //读+写：有读锁，写也需要等待
    //只要有写的存在，都必须等待
    @ResponseBody
    @GetMapping("/read")
    public String readValue(){
        RReadWriteLock lock = redisson.getReadWriteLock("rw-lock");
        String s="";
        //加读锁
        RLock rLock = lock.readLock();
        try {
            redisTemplate.opsForValue().get("writeValue");
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            rLock.unlock();
        }

        return s;
    }

    @ResponseBody
    @GetMapping("/hello")
    public String hello(){
        //1.获取一把锁，只要锁的名字一样，就是同一把锁
        RLock lock = redisson.getLock("my-lock");

        //2.加锁
//        lock.lock();//阻塞式等待。默认加锁都是30s
        //1.锁的自动续期，如果业务超常，运行期间自动给锁续上新的30s，不用担心业务时间长，锁自动过期被删掉
        //2.加锁的业务只要运行完成，就不会给当前锁续期，机试不手动解锁，锁默认在30s后自动删除

        lock.lock(10, TimeUnit.SECONDS);//10秒自动解锁，自动解锁时间一定要大于业务执行时间
        //问题lock.lock(10, TimeUnit.SECONDS);在锁时间到了以后会不会自动续期
        //1.如果我们传递了锁的超时时间，就发送给redis执行脚本，进行占锁，默认超时就是我们指定的时间
        //2.如果我们未指定锁的超时时间，就使用30*1000【lockWatchTimeout看门狗的默认时间】
        //  只要占锁成功，就会启动一个定时任务【重新给锁设置过期时间，新的过期时间就是看门狗的默认时间】,每隔10s都会自动续期，续程30s
        //  internalLockLeaseTime【看门狗时间】/3 ,10s

        //最佳实战
        //1.lock.lock(30, TimeUnit.SECONDS);省掉了整个续期操作、手动解锁
        try {
            System.out.println("枷锁成功，执行业务..."+Thread.currentThread().getId());
            Thread.sleep(30000);
        } catch (InterruptedException e) {
        } finally {
            //3.解锁  假设解锁代码没有运行，redisson不会出现死锁
            System.out.println("释放锁..."+Thread.currentThread().getId());
            lock.unlock();
        }
        return "hello";
    }
}
